Well i have my upper intake manifold off for a good cleaning and a coat of high temp flat black paint, and to re seal and clean all the fittings. i used a very high pressure pressure washer with soap to clean it and worked very very well. I heard bad stories of sandblasting so took a different route as i aint using aircraft stripper... ew.. the pressure washer surprisingly enough removed a very good amount of carbon and build up ( i had ALOT of oil build up as the previous owner probably never heard of a pcv system). Now that it is clean i noticed the inside of the intake on throttle boddie end is really rough. way more rough than i would have thought. i know intakes usually have a bumpy texture but this is pretty terrible, could probably cut my finger on some of the bumps and burs in there. Is it worth any time to smooth them out? has anyone done this before? any performance gains? i got some time before i throw it back on so thats not a issue. i was thinking that using a dremel would make billions of tiny shavings, perfect for the motor to suck in and screw all my pistons over. think i would just shove the pressure washer back in and give er to get the shaving's out. any opinions would be great!